From 6c72cb41a58f300096fad55cadfe64b32754461f Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 12 Mar 2019 12:11:56 -0400
Subject: ob_substvars(): Replace echo in eval command

---
diff --git a/lib/control.sh b/lib/control.sh
index a792486..48b71fa 100644
--- a/lib/control.sh
+++ b/lib/control.sh
@@ -286,7 +286,7 @@ ob_substvars()
 
 		# Perform the substitution.
 		name="$(echo "${name}" | tr 'a-z-' 'A-Z_')"
-		value="$(eval echo \"\$\{"_OB_SUBSTVAR_${name}"\}\")"
+		value="$(eval "printf '%s' \"\${_OB_SUBSTVAR_${name}}\"")"
 		string="${lhs}${value}${rhs}"
 		depth=$(($depth + 1))
 	done
--
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